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  Pile weatherstrip and the manufacture thereofUSPTO Application #: 20060068156Title: Pile weatherstrip and the manufacture thereof Abstract: A pile weatherstrip is formed from a multiple-filament yarn that is knitted into a tape where the yarn lengths extend side-by-side in a direction normal to the length of the tape. Side-by-side yarns are held together by stitching to form a coherent tape which is then fed to a connection zone where the tape is formed into a V and the base of the V is welded into a channel on a carrier. After welding, the top ends of the V-shaped tape are cut off to form a pile. (end of abstract) Agent: Goodwin Procter LLP Patent Administrator - Boston, MA, US Inventors: Charles Holiday, Joseph Coles USPTO Applicaton #: 20060068156 - Class: 428093000 (USPTO) Related Patent Categories: Stock Material Or Miscellaneous Articles, Pile Or Nap Type Surface Or Component, U-, V-, Or W-shaped Or Continuous Strand, Filamentary Material The Patent Description & Claims data below is from USPTO Patent Application 20060068156. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority to and incorporates by reference in its entirety U.K. Application 0421628.9 filed Sep. 29, 2004. FIELD OF THE INVENTION [0002] The invention relates to pile weatherstrip and to the manufacture of pile weatherstrip. Pile weatherstrip is formed by a carrier and a dense pile of fibres extending from the carrier. Pile weatherstrip is generally used in doors or windows where it is mounted between an opening leaf and a fixed frame to provide draft exclusion and/or anti-rattle capabilities. BACKGROUND [0003] A known way of forming such pile weatherstrip is to provide a woven base onto which is a formed plurality of rows of pile by, for example, a weaving process. The base is then coated with a plastics material to form the carrier before being cut between the rows to form individual strips. [0004] This process is subject to significant waste since the cutting between the rows of pile is not always accurate. In addition, it is not easy in such a method to alter either the density of the pile or the height of the pile; this requires significant alteration of the machinery used to form the pile. [0005] U.S. Pat. No. 4,148,953 shows an alternative method in which yarn is wound over a membrane strip and the edges of the strip are then inserted into respective carriers where the edges are welded to the carriers. The strip and the carrier are then slit longitudinally to form two pile weatherstrips. SUMMARY OF THE INVENTION [0006] According to a first aspect of the invention, there is provided a method of forming a pile weatherstrip comprising forming a multi-filament yarn into a tape in which the filaments extend generally transverse to the length of the tape, the tape having spaced side edges, connecting the tape to an elongate carrier along a line extending along the tape intermediate said side edges, the tape being cut along two cut-lines, each line being generally parallel to the connection line and each line being spaced inwardly of an associated side edge to form a pile. [0007] The tape can be made with any required filament density and filament length and the height of the pile can be chosen by adjusting the location of the cut-lines. Thus, pile weatherstrip can be produced very cheaply and easily in a variety of sizes and pile densities. [0008] According to a second aspect of the invention, there is provided a pile weatherstrip comprising a carrier, a knitted tape formed from a multi-filament yarn in which the filaments extend generally transverse to the tape, the tape being connected to the carrier along a centre line of the tape. [0009] According to a third aspect of the invention, there is provided a machine for forming a pile weatherstrip comprising first feed means for feeding a carrier to a connection zone, second feed means for feeding to the connection zone a tape formed of multi-filament yarn in which the filaments extend generally transverse to the length of the tape, the second feeding means folding the tape into a V-section configuration, and connecting means in the connection zone for connecting the base of the V-section to the carrier. [0010] The following is a more detailed description of an embodiment of the invention, by way of example, reference being made to the accompanying drawings in which:-- DESCRIPTION OF THE DRAWINGS [0011] FIG. 1 is a plan view from above of a part of a knitted tape for incorporation into a pile weatherstrip; [0012] FIG. 2 is a schematic view of the machine for forming a pile weatherstrip from the tape of FIG. 1; and [0013] FIG. 3 is a schematic cross-section of a completed pile weatherstrip formed using the machine of FIG. 2. DESCRIPTION OF THE PREFERRED EMBODIMENTS [0014] Referring first to FIG. 1, the tape 10 is formed from a plurality of multi-filament yarns 11 which may, for example, be made of polypropylene. The yarns are formed into the tape 10 by a knitting process in which each yarn 11 is looped in a serpentine path with parallel straight portions 12 interconnected by curved portions 13. In this way, the filaments of the yarns 11 extend generally side-by-side in a direction transverse to the length of the tape. [0015] The knitted yarns 11 are held together by first, second and third lines of stitching 14, 15, 16. The first and second lines of stitching 14, 15 are located adjacent respective opposite side edges 17, 18 of the tape 10. The third line of stitching 16 extends along the centre line of the tape 10. [0016] In this way, a tape 10 is formed that is coherent and can be readily handled without damage. The tape 10 can have any required width adjusted by adjustment of the knitting machine. The density of the yarns 11, the materials of the yarns 11 and the number of yarns making up the tape 10 can all be chosen as required. [0017] The tape 10 is used in a machine shown schematically in FIG. 2. In the machine, the tape 10 is fed to a connection zone, indicated generally at 19, by first feed means. These feed means configure the tape 10 into a V-shaped cross-section with the third row of stitching 16 at the base of the V. [0018] Second feed means feed a carrier 20 to the connection zone 19. The carrier 20 is formed from a solid plastics material and comprises a base 21 having an upper surface 22 and a lower surface 23. The upper surface 22 is formed with a pair of longitudinally extending side-by-side spaced ribs 24a, 24b so that the ribs 24a, 24b and the upper surface form a channel 25. Continue reading... Full patent description for Pile weatherstrip and the manufacture thereof Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Pile weatherstrip and the manufacture thereof patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. 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